8 Climatic Facts About Our Abnormally Warm Winter

Christof Stache/AFP/Getty Images
Christof Stache/AFP/Getty Images

It was warm this winter. Freakishly warm, in fact. It was warm enough that we probably should have felt guilty for enjoying it so much. After all, any time you can open your windows when you’re supposed to be shivering and watching travel shows for warmth is a strange situation. Most of the United States just lived through one of the warmest Februarys on record to close out one of the warmest winters on record. Here are some statistics that will show you just how unusually balmy it’s been for the past three months.

1. THIS FEBRUARY WAS WARMER THAN NORMAL.

A map of how warm this February was compared to previous years. Stations showing a ‘1’ experienced the warmest February ever recorded at that location. Image Credit: SERCC

 
It shouldn’t come as any shock that February’s temperatures were above-average when you crunch the numbers. Out of 888 weather observing stations across the lower 48, a solid 60 percent of those stations (or 534 locations) saw their top-10 warmest February on record this year. Even worse is that 186 of those locations—scattered from the depths of Texas to the Canadian border—recorded their all-time warmest February, with some records stretching back more than 100 years.

2. THE WHOLE WINTER WAS WARMER THAN NORMAL.

Not only was this past February a record-breaker, but the whole winter was warm on average. Data from the Southeast Regional Climate Center shows that over half of those 888 weather observing stations in the contiguous United States saw this winter place among the top ten warmest winters ever recorded, with almost all of the toasty stations residing east of the Rocky Mountains. Most of the all-time warmest winter records were set in the southern part of the country, including cities like Houston, Texas, and Raleigh, North Carolina.

3. THE WARMTH KEPT MOST OF THE SNOW AT BAY.

Taken just one day apart in early February, two views of the downtown Manhattan skyline—one warm and sunny, the other obscured by snow—as seen from the Brooklyn Heights Promenade. Image Credit: Spencer Platt/Getty Images

 
As you can imagine, you’re not going to find very much snow when it’s relatively toasty out there. There have been other winters with less snow than most places saw this year, but the differences are negligible. Take Washington D.C., for example. Washington National Airport, which sits just across the Potomac River from the capital city itself, typically sees about 15 inches of snow every year. They’ve recorded just over an inch of snow this year. On the list of least-snowy winters in the nation’s capital, this winter ranks fourth since records began in 1940.

4. CHICAGO SAW NO SNOW IN JANUARY OR FEBRUARY.

Even more unusual is the fact that Chicago went through the entire months of January and February without seeing one lick of snow cover the ground. According to the city’s National Weather Service office, this was the first time in the city’s 146 years of recording weather observations that they didn’t see any snow on the ground during the dead of winter. The city saw a foot-and-a-half of snow spread out over several storms during the month of December, but all of that snow melted by Christmas. The most they’ve seen since then is a “trace” of snow, which is snow that falls but instantly melts when it hits the ground.

5. THE GREAT LAKES WERE RELATIVELY ICE-FREE.

While we’re looking toward the Midwest, it’s worth noting that the Great Lakes were surprisingly ice-free this season. The five lakes only saw about 15 percent of their surface covered by ice during the season’s maximum extent on February 8, and what little ice did form this year is rapidly melting as warm air continues to bathe the enormous bodies of water. Since NOAA began keeping records back in 1973, a typical winter sees a little more than half of the Great Lakes covered with ice during the peak of winter, but the coverage has been as low as 11 percent, a record achieved in 2002.

6. THE LEAVES LOVED IT, THOUGH.

A map showing how unusually early (or late) leaves first showed up on trees in 2017 compared to normal. Image Credit: USANPN

Humans aren’t the only organisms enjoying the reprieve from winter’s grip. The USA National Phenology Network tracks the extent of trees budding and growing leaves as spring begins to set in. According to their observations, almost every part of the United States that has leaves on its trees right now saw those leaves appear a full three weeks ahead of schedule—what it calls "very large anomalies." This is welcome news for the birds and the bees, but if there’s a sudden cold snap in March—which isn’t unheard of—it could do some serious damage to any plants that are suddenly more vulnerable than normal.

7. THE WARMTH LED TO SOME SEVERE THUNDERSTORMS.

When you put an active weather pattern together with warm and unstable air, it’s almost inevitable that you’ll wind up with strong thunderstorms at some point. We saw several rounds of severe weather this spring, resulting in at least three fatalities on the last day of February. Severe weather is fairly common in the southeast due to its proximity to muggy air over the Gulf of Mexico, but severe weather stretched unusually far north this year. A tornado that touched down in western Massachusetts on February 25 was the only tornado ever recorded in the state during the month of February, and quite possibly the farthest north we’ve ever seen a tornado since reliable records began in 1950.

8. SO WHY HAS IT BEEN SO WARM?

Why has it been so warm in the east and so cool and active out west? It has to do with the jet stream. For the past couple of years, there’s been a huge ridge in the jet stream over the West Coast that kept them warm and dangerously dry, while the jet stream dipped south and brought cooler, more active weather to the rest of the United States. That pattern broke this year, essentially reversing itself and keeping the warmth-inducing ridge out east while the jet stream in the west keeps dipping south and bringing them a steady stream of rough weather. One theory as to why the pattern flipped is the disappearance of the infamous “Blob,” a nickname given to an unusually warm area of water in the northeastern Pacific Ocean. That water cooled off, which may have allowed the jet stream to readjust itself into the pattern we’ve seen this winter.

What Is a Bomb Cyclone?

Maddie Meyer/Getty Images
Maddie Meyer/Getty Images

The phrase bomb cyclone has re-entered the news this week as parts of the central U.S. face severe weather. Mountain and Midwestern states, including Colorado, Nebraska, Wyoming, and South Dakota, all fall in the path of a winter storm expected to deliver tornadoes, hail, heavy snow, flooding, and hurricane-force winds on Wednesday, March 13 into Thursday. It seems appropriate for a storm that strong to have bomb in its name, but the word actually refers to a meteorological phenomenon and not the cyclone's explosive intensity.

According to The Denver Post, the bomb in bomb cyclone stands for bombogenesis. Bombogenesis occurs when a non-tropical storm experiences at least a 24 millibar (the unit used to measure barometric pressure) drop within 24 hours. Low pressure makes for intense storms, so a bomb cyclone is a system that's built up a significant amount strength in a short length of time.

This type of storm usually depends on the ocean or another large body of water for its power. During the winter, the relatively warm air coming off the ocean and the cold air above land can collide to create a sharp drop in atmospheric pressure. Also known as a winter hurricane, this effect has produced some of the worst snowstorms to ever hit the U.S.

The fact that this latest bomb cyclone has formed nowhere near the coast makes it even more remarkable. Rather, a warm, subtropical air mass and a cold, Arctic air mass crossed paths, creating the perfect conditions for a rare bombogenesis over the Rockies and Great Plains states.

Central U.S. residents in the bomb cyclone's path have taken great precautions ahead of the storm. Over 1000 flights have been canceled for Wednesday and schools throughout Colorado have closed.

[h/t The Denver Post]

Watch a Rare ‘Ice Tsunami’ Slam Lake Erie

Clean Lakes Alliance, Flickr // CC BY 2.0
Clean Lakes Alliance, Flickr // CC BY 2.0

A combination of freezing cold temperatures and high winds is creating an unusual phenomenon along Lake Erie. As KDKA reports, ice tsunamis are toppling onto lake shores, and many locals have been asked to stay inside and even evacuate their homes.

On February 24, 2019, the National Weather Service in Buffalo, New York issued a warning about dangerous wind gusts in the Lake Erie area. The service urged citizens to seek shelter indoors and avoid traveling if possible. Winds peaked at 74 mph earlier this week, the level of a Category 1 hurricane, and tore down trees and power lines throughout the region.

People who got close to Lake Erie during the windstorm witnessed a rare event known as an ice tsunami. When wind pushed ice on the lake's surface toward the retaining wall, the sheet broke apart and dumped massive ice chunks on the shore. The video below captures the phenomenon.

In some areas, the ice piles grew so large that roadways had to be closed. Residents of Hamburg, New York's Hoover Beach area were asked to voluntarily evacuate due to the encroaching ice.

Ice tsunamis, or ice shoves, are rare, but in some cases they can be life-threatening. In 2013, waves of ice shards from a Minnesota lake destroyed people's homes.

[h/t KDKA]

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